EP0033963A2 - Joint d'étanchéité de type radial - Google Patents

Joint d'étanchéité de type radial Download PDF

Info

Publication number
EP0033963A2
EP0033963A2 EP81100876A EP81100876A EP0033963A2 EP 0033963 A2 EP0033963 A2 EP 0033963A2 EP 81100876 A EP81100876 A EP 81100876A EP 81100876 A EP81100876 A EP 81100876A EP 0033963 A2 EP0033963 A2 EP 0033963A2
Authority
EP
European Patent Office
Prior art keywords
shaft
sealing
sealing ring
sealed
ribs
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81100876A
Other languages
German (de)
English (en)
Other versions
EP0033963B1 (fr
EP0033963A3 (en
Inventor
Karl Braconier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carl Freudenberg KG
Original Assignee
Carl Freudenberg KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carl Freudenberg KG filed Critical Carl Freudenberg KG
Priority to AT81100876T priority Critical patent/ATE7528T1/de
Publication of EP0033963A2 publication Critical patent/EP0033963A2/fr
Publication of EP0033963A3 publication Critical patent/EP0033963A3/de
Application granted granted Critical
Publication of EP0033963B1 publication Critical patent/EP0033963B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3244—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with hydrodynamic pumping action

Definitions

  • the invention relates to a radial shaft sealing ring for the gap between a rotatable shaft and a surrounding, fixed housing.
  • a sealing ring of the type mentioned above is known from CH-PS 471 992.
  • the projections which effect the dynamic sealing are arranged on a conical surface, and they serve exclusively to return the sealed medium from the sealing edge which effects the static sealing.
  • the return effect achieved increases with increasing shaft speed, and to the same extent that the medium to be sealed is kept away from the sealing edge which effects the static sealing, the proportion of the amount of heat dissipated per unit of time by the sealed medium decreases. This can result in a large build-up of heat at the sealing edge and, at high shaft speeds, embrittlement or burning of the rubber-elastic sealing material.
  • a radial shaft sealing ring is proposed, the sealing lip of which has return ribs arranged on a cylindrical surface, the area of which is delimited by statically acting sealing edges on both sides in the axial direction.
  • the space between the sealing edges is directly connected to the sealed space through the sealing lip through openings that penetrate in the radial direction.
  • both in technical and in economic terms such radial shaft seals are not yet completely satisfactory.
  • the two sealing edges are acted upon in different ways by the medium conveyed back into the sealed space by the return ribs and accordingly cooled differently. The risk of premature damage, in particular to the outer sealing edge, is thus insufficiently eliminated.
  • the proposed shaft sealing ring resembles in its outer shape and in terms of its practical application a design according to CH-PS 471 992 mentioned at the beginning. In contrast to this, however, all the functional elements which effect the actual sealing are combined in a sealing surface which is parallel to the axis of the sealed Shaft extends.
  • the projections which effect the dynamic sealing have the shape of damming ribs which extend radially inwards from a cylindrical surface of the sealing ring surrounding the shaft at a distance and which form an angle with the axis of rotation of the shaft, thereby in the direction of the sealed medium open chambers are formed.
  • the annular spring which presses the sealing lip onto the shaft is dimensioned such that the spring force is compensated for by the radially outwardly directed hydrodynamic force which builds up at high shaft speed.
  • the sealing ring is thereby expanded in the radial direction, and the sealing edge and the return ribs are at a distance from the surface of the sealed shaft.
  • the proposed shaft seal therefore works without wear.
  • the size of the distance increases with increasing shaft speed and remains constant when a certain shaft speed is reached. It is directly dependent on the size of the hydrodynamic forces acting in the sealing gap and therefore a good seal is guaranteed regardless of the respective shaft speed. As the shaft speed decreases, the width of the gap decreases until the shaft comes to a standstill and the sealing edge is pressed against the sealed shaft.
  • the sealing of the gap in this operating state is of a purely static nature. Since the sealed medium is no longer returned to the sealed area to a large extent immediately before the shaft comes to a standstill, sufficient wetting and sufficient lubrication of the sealing edge are ensured. This can be cylindrical, which results in an improvement in the general wear behavior. The dimensional relationships existing on the new shaft sealing ring between the sealing edge and between the retaining ribs are thereby retained and it is not necessary to grind in the shaft sealing ring in order to achieve its operability.
  • the radial shaft sealing ring 18 consists of an annular, rigid stiffening ring 20 with an angular profile made of sheet steel and a sealing ring 22, which is vulcanized onto the radially inward leg of the stiffening ring.
  • the sealing ring therefore consists of a rubber-elastic material.
  • the sealing ring has a central axis 13 which coincides with that of the shaft 12 and contains an integral, radially inwardly extending, flexible inner part 24 which ends in an annular sealing surface 26.
  • the sealing surface slides on the outer circumference of the sealed shaft 12.
  • the sealing surface is limited in the direction of the sealed medium by the conical surface 40 of the sealing ring 24, in the direction of the outside air by the conical surface 50.
  • the sealing ring has an annular circumferential groove 30 radially outside of the sealing surface, in which the helical spring 32 is mounted.
  • the coil spring is a tension spring, which is directed radially inwards Exerts force on the sealing ring 24.
  • the sealing surface 26 is delimited on the side facing the outside air by a cylindrical circumferential sealing edge 34, on the side facing the sealed medium by the partial area 38 which effects the dynamic sealing. This consists of a space surrounding the shaft even at a standstill, Cylindrical surface 26 of the sealing ring 24 on which the radially inwardly extending baffle ribs 44 are arranged.
  • the cylindrical surface 26 thus extends parallel to the sealing surface of the sealing edge 34 on the side of the sealing ring facing the sealed medium.
  • the inner surfaces 46 of the ribs 44 are arranged on an interrupted, cylindrical surface which has a diameter which is not smaller than that of the sealing edge 34 which effects the static sealing.
  • the cylindrical surface 42 and the retaining ribs 44 form chambers 48 which in Direction of the sealed medium are open.
  • the annular helical spring 32 exerts a spring force which presses the circumferential sealing edge 34 against the sealed shaft 12 so as to prevent the sealed medium, for example a liquid, from flowing out along the shaft 12.
  • the chambers 48 are open in the direction of the sealed medium, and this means that the sealing surface 36 and the inner surfaces 46 of the ribs 44 can be lubricated to a sufficient extent to prevent heating during the initial phase of the shaft start.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Diaphragms And Bellows (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Mechanical Sealing (AREA)
  • General Details Of Gearings (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
EP81100876A 1980-02-07 1981-02-07 Joint d'étanchéité de type radial Expired EP0033963B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81100876T ATE7528T1 (de) 1980-02-07 1981-02-07 Radialwellendichtring.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US119297 1980-02-07
US06/119,297 US4288083A (en) 1980-02-07 1980-02-07 Hydrodynamic shaft seal

Publications (3)

Publication Number Publication Date
EP0033963A2 true EP0033963A2 (fr) 1981-08-19
EP0033963A3 EP0033963A3 (en) 1981-09-02
EP0033963B1 EP0033963B1 (fr) 1984-05-16

Family

ID=22383634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81100876A Expired EP0033963B1 (fr) 1980-02-07 1981-02-07 Joint d'étanchéité de type radial

Country Status (8)

Country Link
US (1) US4288083A (fr)
EP (1) EP0033963B1 (fr)
JP (1) JPS56150670A (fr)
AT (1) ATE7528T1 (fr)
BR (1) BR8100757A (fr)
CA (1) CA1135743A (fr)
DE (2) DE3163556D1 (fr)
MX (1) MX154225A (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323741A1 (de) * 1983-07-01 1985-01-17 Fa. Carl Freudenberg, 6940 Weinheim Wellendichtring
EP0183897A1 (fr) * 1984-11-08 1986-06-11 Firma Carl Freudenberg Joint d'étanchéité de type radial
DE3526424C1 (de) * 1985-07-24 1987-02-12 Fa. Carl Freudenberg, 6940 Weinheim Radialwellendichtring und Verfahren zu seiner Herstellung
WO1987001169A1 (fr) * 1985-08-20 1987-02-26 George Angus & Company Limited Joints etanches aux huiles pour arbres et analogues
EP0213652A1 (fr) * 1985-07-15 1987-03-11 Ihc Holland N.V. Joint d'étanchéité de type radial
CN104712661A (zh) * 2013-12-11 2015-06-17 舍弗勒技术股份两合公司 滚动轴承

Families Citing this family (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4531747A (en) * 1982-11-01 1985-07-30 Nippon Oil Seal Industry Co., Ltd. Extended wear annular oil seal
US4610319A (en) * 1984-10-15 1986-09-09 Kalsi Manmohan S Hydrodynamic lubricant seal for drill bits
DE3607535A1 (de) * 1986-03-07 1987-09-10 Kugelfischer G Schaefer & Co Abgedichtetes waelzlager
DE3678953D1 (de) * 1986-05-29 1991-05-29 Manmohan Singh Kalsi Hydrodynamisch schmierende dichtung fuer bohrmeissel.
DE4200927C2 (de) * 1991-01-23 1994-02-03 Freudenberg Carl Fa Radialwellendichtring
CA2152737C (fr) * 1995-03-03 2001-11-20 David E. Johnston Joint d'etancheite permettant une circulation bidirectionnelle du fluide
EP0835398B1 (fr) * 1995-06-27 2004-11-24 Kalsi Engineering, Inc. Dispositif d'etancheite d'arbre rotatif, hydrodynamique resistant a l'inclinaison et a la torsion
US6105968A (en) 1997-02-24 2000-08-22 Massachusetts Institute Of Technology Textured seal for reduced wear
JPH10231937A (ja) 1997-02-24 1998-09-02 Caterpillar Inc 凹凸状シール
EP0939257A3 (fr) * 1998-02-27 2000-05-31 NOK Corporation Joint à lèvre
US6494462B2 (en) 1998-05-06 2002-12-17 Kalsi Engineering, Inc. Rotary seal with improved dynamic interface
US6767016B2 (en) 1998-05-20 2004-07-27 Jeffrey D. Gobeli Hydrodynamic rotary seal with opposed tapering seal lips
US6619664B1 (en) * 1998-12-18 2003-09-16 Caterpillar Inc Wear improvement to textured lip seal
AU4678700A (en) 1999-04-26 2000-11-10 Kalsi Engineering, Inc. Improved skew resisting hydrodynamic seal
US7052020B2 (en) * 1999-05-19 2006-05-30 Kalsi Engineering, Inc. Hydrodynamic rotary seal
US6685194B2 (en) 1999-05-19 2004-02-03 Lannie Dietle Hydrodynamic rotary seal with varying slope
JP2001317635A (ja) * 2000-05-02 2001-11-16 Toyota Industries Corp リップ型シール
US6729624B1 (en) * 2001-02-20 2004-05-04 Freudenberg-Nok General Partnership Radial shaft seal
JP2003035373A (ja) * 2001-07-23 2003-02-07 Toyota Industries Corp 軸封装置及び該軸封装置を備えた圧縮機、軸封方法
JP4600633B2 (ja) * 2001-09-20 2010-12-15 Ｎｏｋ株式会社 オイルシール
JP2003343737A (ja) * 2002-05-30 2003-12-03 Mitsubishi Cable Ind Ltd 回転軸シール
EP1669646A4 (fr) * 2003-09-19 2012-02-15 Nok Corp Dispositif d'etancheite
JP2006242373A (ja) * 2004-09-24 2006-09-14 Nok Corp 密封装置
RU2400662C2 (ru) 2005-03-22 2010-09-27 Колси Энджиниринг, Инк. Гидродинамическое уплотнение вращающегося соединения
CA2601655C (fr) 2005-03-28 2013-09-24 Kalsi Engineering, Inc. Joint dynamique composite haute temperature et procede pour le produire
WO2007079497A2 (fr) 2006-01-04 2007-07-12 Kalsi Engineering, Inc. Geometrie de stabilisation pour joints rotatifs hydrodynamiques
US7828300B2 (en) * 2006-09-21 2010-11-09 Nok Corporation Sealing device for reciprocating shaft
DE102006058699A1 (de) * 2006-12-13 2008-06-26 Ab Skf Anordnung
WO2008126478A1 (fr) * 2007-04-11 2008-10-23 Nok Corporation Joint étanche à l'huile
US7963526B2 (en) * 2007-05-15 2011-06-21 Freudenberg-Nok General Partnership Prelubricated multi-lipped radial shaft seal with large radial offset accommodation
JP2009074602A (ja) * 2007-09-20 2009-04-09 Nok Corp オイルシール
US9109703B2 (en) 2010-02-11 2015-08-18 Kalsi Engineering, Inc. Hydrodynamic backup ring
US9429238B2 (en) 2009-11-30 2016-08-30 Kalsi Engineering, Inc. Dynamic backup ring assembly
US9845879B2 (en) 2009-11-30 2017-12-19 Kalsi Engineering, Inc. High pressure dynamic sealing arrangement
US9103446B2 (en) * 2010-09-15 2015-08-11 Aktiebolaget Skf Fluid seal assembly
CN103299025A (zh) * 2011-01-11 2013-09-11 帕克汉尼芬公司 带有通电弹簧唇部的流线分流器密封装置
US20130228978A1 (en) * 2011-03-31 2013-09-05 Eagle Industry Co., Ltd. Sealing device and sealing structure
JP5637172B2 (ja) * 2012-04-27 2014-12-10 Nok株式会社 密封装置
DE102013207029B4 (de) * 2013-04-18 2016-05-04 Aktiebolaget Skf Radialwellen-Dichtungsanordnung
US10330203B2 (en) 2017-01-06 2019-06-25 Kalsi Engineering Inc. High pressure dynamic sealing device
DE102017202610A1 (de) * 2017-02-17 2018-08-23 Trelleborg Sealing Solutions Germany Gmbh Dichtungsanordnung und Dichtungselement mit hochdruckseitiger Spülfunktion
US10302200B2 (en) 2017-05-16 2019-05-28 Kalsi Engineering, Inc. Seal for bi-directional rotation and pressure
EP3793794A4 (fr) 2018-05-15 2022-02-09 Kalsi Engineering, Inc. Joint rotatif et procédé de fabrication associé
CN111810639B (zh) * 2020-06-04 2022-11-15 江门市鑫辉密封科技有限公司 一种自排润滑脂的密封圈及密封装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501155A (en) * 1967-05-22 1970-03-17 Gen Motors Corp Bi-directional seal
DE1525882A1 (de) * 1965-11-29 1970-07-09 Stensholms Fabriks Ab Dichtring einer Wellenabdichtungseinrichtung
FR2456888A1 (fr) * 1979-05-14 1980-12-12 Procal Dispositif d'etancheite a effet hydrodynamique

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4330970Y1 (fr) * 1964-06-16 1968-12-17
US3534969A (en) * 1966-09-27 1970-10-20 Gen Motors Corp Seal
GB1239873A (en) * 1968-07-06 1971-07-21 Richard Heinrich Shaft seal
DE1941675B2 (de) * 1969-08-16 1971-12-23 Kupfer Asbest Co Gustav Bach, 7100 Heilbronn Dichtmanschette fuer eine radial wellendichtring
US3633927A (en) * 1970-02-11 1972-01-11 Federal Mogul Corp Molded-lip hydrodynamic shaft seal
JPS49147461U (fr) * 1973-04-23 1974-12-19
US3913925A (en) * 1973-11-28 1975-10-21 Borg Warner Positive lubrication hydrodynamic lip seal
AU8361475A (en) * 1974-08-15 1977-02-03 Repco Res Pty Ltd Seal
JPS5547050A (en) * 1978-09-29 1980-04-02 Arai Pump Mfg Co Ltd Cylindrical surface seal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1525882A1 (de) * 1965-11-29 1970-07-09 Stensholms Fabriks Ab Dichtring einer Wellenabdichtungseinrichtung
US3501155A (en) * 1967-05-22 1970-03-17 Gen Motors Corp Bi-directional seal
FR2456888A1 (fr) * 1979-05-14 1980-12-12 Procal Dispositif d'etancheite a effet hydrodynamique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3323741A1 (de) * 1983-07-01 1985-01-17 Fa. Carl Freudenberg, 6940 Weinheim Wellendichtring
EP0183897A1 (fr) * 1984-11-08 1986-06-11 Firma Carl Freudenberg Joint d'étanchéité de type radial
EP0213652A1 (fr) * 1985-07-15 1987-03-11 Ihc Holland N.V. Joint d'étanchéité de type radial
US4750748A (en) * 1985-07-15 1988-06-14 Ihc Holland N.V. Shaft seal with flexible midportion and garter spring
DE3526424C1 (de) * 1985-07-24 1987-02-12 Fa. Carl Freudenberg, 6940 Weinheim Radialwellendichtring und Verfahren zu seiner Herstellung
WO1987001169A1 (fr) * 1985-08-20 1987-02-26 George Angus & Company Limited Joints etanches aux huiles pour arbres et analogues
US4815749A (en) * 1985-08-20 1989-03-28 George Angus & Company Limited Shaft and like oil seals
CN104712661A (zh) * 2013-12-11 2015-06-17 舍弗勒技术股份两合公司 滚动轴承

Also Published As

Publication number Publication date
DE3163556D1 (en) 1984-06-20
JPS6261825B2 (fr) 1987-12-23
JPS56150670A (en) 1981-11-21
BR8100757A (pt) 1981-08-25
DE8103319U1 (de) 1981-07-09
EP0033963B1 (fr) 1984-05-16
EP0033963A3 (en) 1981-09-02
MX154225A (es) 1987-06-19
CA1135743A (fr) 1982-11-16
ATE7528T1 (de) 1984-06-15
US4288083A (en) 1981-09-08

Similar Documents

Publication Publication Date Title
EP0033963A2 (fr) Joint d'étanchéité de type radial
DE3526424C1 (de) Radialwellendichtring und Verfahren zu seiner Herstellung
EP0230503B1 (fr) Joint à lèvre
EP0362468A1 (fr) Joint à lèvre
DE2350630C2 (de) Hydrodynamische Wellendichtung
EP0062098A2 (fr) Turbine hydraulique
DE69404658T2 (de) Verriegelte dichtung und hülse für ölfillmlager eines walzwerkes
DE2949839A1 (de) Dichtring
DE3440797A1 (de) Radialwellendichtring
CH646763A5 (de) Wellendichtung fuer hydraulische maschinen.
DE1961639C3 (de) Stevenrohrabdichtung
DE3409981C2 (fr)
EP0117267B1 (fr) Bague d'étanchéité
DD149401A5 (de) Ventildichtung
DE69205089T2 (de) Dynamische Drucklagervorrichtung.
DE2546805C3 (de) Dichtring für drehbare Körper, wie Wellen o.dgl.
DE1954972C3 (de) Wellenlippendichtung
EP0369131B1 (fr) Bagues à lèvres radiales
DE4401567C1 (de) Wellendichtung
DE2008689C3 (de) Wellendichtung
DE102016015553B4 (de) Radialwellendichtung
EP0149708B1 (fr) Joint pour arbre
DE2352992A1 (de) Radial-wellendichtring
DE7812669U1 (de) Abgedichtetes Wälzlager
DE2753283A1 (de) Antriebsmechanismus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT NL SE

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19810701

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 7528

Country of ref document: AT

Date of ref document: 19840615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3163556

Country of ref document: DE

Date of ref document: 19840620

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19920115

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19920121

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19920124

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19920127

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19920211

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19920212

Year of fee payment: 12

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19920229

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19920303

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920310

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19930207

Ref country code: AT

Effective date: 19930207

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19930208

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19930228

Ref country code: CH

Effective date: 19930228

Ref country code: BE

Effective date: 19930228

BERE Be: lapsed

Owner name: FIRMA CARL FREUDENBERG

Effective date: 19930228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19930901

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19930207

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19931029

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 81100876.2

Effective date: 19930912